Govan Archibald Mvunyelwa Mbeki was a South African politician, military commander, Communist leader who served as the Secretary of Umkhonto we Sizwe, at its inception in 1961. He was also the son of Chief Sikelewu Mbeki and Johanna Mahala and also the father of the former South African president Thabo Mbeki and political economist Moeletsi Mbeki. He was a leader of the South African Communist Party and the African National Congress. After the Rivonia Trial, he was imprisoned (1963–1987) on charges of terrorism and treason, together with Nelson Mandela, Walter Sisulu, Raymond Mhlaba, Ahmed Kathrada and other eminent ANC leaders, for their role in the ANC's armed wing, Umkhonto we Sizwe (MK). He was sometimes mentioned by his nickname "Oom Gov".

uMkhonto we Sizwe was the paramilitary wing of the African National Congress (ANC), and was founded by Nelson Mandela in the wake of the Sharpeville massacre. Its mission was to fight against the South African government.